Simultaneous Analysis of High-Precision Electrostatic Charging on Particles Caused by Work Function with Electric Field Control and Particle Movement in Multiple Fields

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A new method for characterizing particles triboelectrically charged through repeated contact with a wall has been studied both theoretically and experimentally. The condenser model was applied to formulate the particle charging. In the experiment, particles that were fed on a vibration plate could travel on the surface, and the charge on the particles was measured using a Faraday cup. Particle behavior on the oscillating plate was observed using a high-speed camera with a zoom lens. It was found that the profile of particle charge as a function of distance travelled on the vibrating plate or the number of particle-wall contacts agreed well with the theoretical one, which is determined by two parameters related to equilibrium and relaxation. It was also found that particle tribocharging is well-characterized by the values of the parameters obtained by external electric fields.